One of the three tiger cubs orphaned by a Swiss Shepherd dog, rests at home of Natalia Stepanova, a veterinarian of the Oktyabrsky Zoo, in the Russian Black Sea resort of Sochi, on December 4, 2012, with Stepanova's cat (back) attending. The three little tigers, two male and one female cubs, were born last month in the Oktyabrsky Zoo in Sochi but abandoned by their birth mother, tigress Bagira. AFP PHOTO / MIKHAIL MORDASOV AFP PHOTO / MIKHAIL MORDASOVMIKHAIL MORDASOV/AFP/Getty Images less

One of the three tiger cubs orphaned by a Swiss Shepherd dog, rests at home of Natalia Stepanova, a veterinarian of the Oktyabrsky Zoo, in the Russian Black Sea resort of Sochi, on December 4, 2012, with ... more

Photo: MIKHAIL MORDASOV, AFP/Getty Images

One of the three tiger cubs orphaned by a Swiss Shepherd dog, rests... Photo-5954453.80970 - NewsTimes

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One of the three tiger cubs orphaned by a Swiss Shepherd dog, rests at home of Natalia Stepanova, a veterinarian of the Oktyabrsky Zoo, in the Russian Black Sea resort of Sochi, on December 4, 2012. The three little tigers, two male and one female cubs, were born last month in the Oktyabrsky Zoo in Sochi but abandoned by their birth mother, tigress Bagira. AFP PHOTO / MIKHAIL MORDASOV AFP PHOTO / MIKHAIL MORDASOVMIKHAIL MORDASOV/AFP/Getty Images less

One of the three tiger cubs orphaned by a Swiss Shepherd dog, rests at home of Natalia Stepanova, a veterinarian of the Oktyabrsky Zoo, in the Russian Black Sea resort of Sochi, on December 4, 2012. The three ... more

Photo: MIKHAIL MORDASOV, AFP/Getty Images

One of the three tiger cubs orphaned by a Swiss Shepherd dog, rests... Photo-5954454.80970 - NewsTimes

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One of the three tiger cubs orphaned by Swiss Shepherd dog, Talli, rests near Talli's own cubs in the Russian Black Sea resort of Sochi, on December 4, 2012. Three little tigers, two male and one female cubs, were born last month in the Oktyabrsky Zoo in Sochi but abandoned by their birth mother, tigress Bagira. AFP PHOTO / MIKHAIL MORDASOV AFP PHOTO / MIKHAIL MORDASOVMIKHAIL MORDASOV/AFP/Getty Images less

One of the three tiger cubs orphaned by Swiss Shepherd dog, Talli, rests near Talli's own cubs in the Russian Black Sea resort of Sochi, on December 4, 2012. Three little tigers, two male and one female cubs, ... more

Photo: MIKHAIL MORDASOV, AFP/Getty Images

One of the three tiger cubs orphaned by Swiss Shepherd dog, Talli,... Photo-5954455.80970 - NewsTimes

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Four white lions and four white tigers pose for a picture on January 30, 2013 at the Serengeti wildlife park in Hodenhagen, central Germany. The tiger cubs were born at the park in October 2012, the lion cubs in November 2012, also at the park. AFP PHOTO / JULIAN STRATENSCHULTE GERMANY OUTJULIAN STRATENSCHULTE/AFP/Getty Images less

Four white lions and four white tigers pose for a picture on January 30, 2013 at the Serengeti wildlife park in Hodenhagen, central Germany. The tiger cubs were born at the park in October 2012, the lion cubs ... more

Photo: JULIAN STRATENSCHULTE, AFP/Getty Images

Four white lions and four white tigers pose for a picture on... Photo-5954456.80970 - NewsTimes

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A white tiger cub gets a physical examination on January 30, 2013 at the Serengeti wildlife park in Hodenhagen, central Germany. The tiger cub was born at the park in October 2012. AFP PHOTO / JULIAN STRATENSCHULTE GERMANY OUTJULIAN STRATENSCHULTE/AFP/Getty Images less

A white tiger cub gets a physical examination on January 30, 2013 at the Serengeti wildlife park in Hodenhagen, central Germany. The tiger cub was born at the park in October 2012. AFP PHOTO / JULIAN ... more

A white lion cub hisses on January 30, 2013 at the Serengeti wildlife park in Hodenhagen, central Germany. Four white tiger cubs were born at the park in October 2012, four white lion cubs were born in November 2012, also at the park. AFP PHOTO / JULIAN STRATENSCHULTE GERMANY OUTJULIAN STRATENSCHULTE/AFP/Getty Images less

A white lion cub hisses on January 30, 2013 at the Serengeti wildlife park in Hodenhagen, central Germany. Four white tiger cubs were born at the park in October 2012, four white lion cubs were born in November ... more

Photo: JULIAN STRATENSCHULTE, AFP/Getty Images

A white lion cub hisses on January 30, 2013 at the Serengeti... Photo-5954458.80970 - NewsTimes

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Three white tiger cubs are seen on January 30, 2013 at the Serengeti wildlife park in Hodenhagen, central Germany. Four white tiger cubs were born at the park in October 2012, four white lion cubs were born in November 2012, also at the park. AFP PHOTO / JULIAN STRATENSCHULTE GERMANY OUTJULIAN STRATENSCHULTE/AFP/Getty Images less

Three white tiger cubs are seen on January 30, 2013 at the Serengeti wildlife park in Hodenhagen, central Germany. Four white tiger cubs were born at the park in October 2012, four white lion cubs were born in ... more

Photo: JULIAN STRATENSCHULTE, AFP/Getty Images

Three white tiger cubs are seen on January 30, 2013 at the... Photo-5954459.80970 - NewsTimes

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TOPSHOTS
Keepers hold a white tiger cub during an examination on January 30, 2013 at the Serengeti wildlife park in Hodenhagen, central Germany. The tiger cub was born at the park in October 2012. AFP PHOTO / JULIAN STRATENSCHULTE GERMANY OUTJULIAN STRATENSCHULTE/AFP/Getty Images less

TOPSHOTS
Keepers hold a white tiger cub during an examination on January 30, 2013 at the Serengeti wildlife park in Hodenhagen, central Germany. The tiger cub was born at the park in October 2012. AFP ... more

SAN FRANCISCO, CA - APRIL 12: A two-month-old Sumatran tiger cub plays with its mother, Leanne, in their enclosure at the San Francisco Zoo on April 12, 2013 in San Francisco, California. The san Francisco Zoo introduced a two-month-old Sumatran tiger cub to the public for the first time since it was born. (Photo by Justin Sullivan/Getty Images) *** BESTPIX *** less

SAN FRANCISCO, CA - APRIL 12: A two-month-old Sumatran tiger cub plays with its mother, Leanne, in their enclosure at the San Francisco Zoo on April 12, 2013 in San Francisco, California. The san Francisco ... more

SAN FRANCISCO, CA - APRIL 12: A two-month-old Sumatran tiger cub sits in the grass with its mother, Leanne, in their enclosure at the San Francisco Zoo on April 12, 2013 in San Francisco, California. The san Francisco Zoo introduced a two-month-old Sumatran tiger cub to the public for the first time since it was born. (Photo by Justin Sullivan/Getty Images) less

SAN FRANCISCO, CA - APRIL 12: A two-month-old Sumatran tiger cub sits in the grass with its mother, Leanne, in their enclosure at the San Francisco Zoo on April 12, 2013 in San Francisco, California. The san ... more

WASHINGTON, DC - NOVEMBER 06: A female Sumatran Tiger cub named Sukacita is placed into a moat by biologist Leigh Pitsko (R) before the cub performed her "swim test" at the Great Cats exhibit of the National Zoo November 6, 2013 in Washington, DC. Sukacita is one of two Sumatran Tigers born August 5, 2013 and before going on exhibit they must pass the swim test. The cubs must be able to keep their heads above water, navigate the shallow end of the moat, and have the strength and agility to climb onto dry land on their own. (Photo by Win McNamee/Getty Images) less

WASHINGTON, DC - NOVEMBER 06: A female Sumatran Tiger cub named Sukacita is placed into a moat by biologist Leigh Pitsko (R) before the cub performed her "swim test" at the Great Cats exhibit of the National ... more

AP10ThingsToSee - A three-month-old Sumatran tiger cub named "Bandar" reacts after being dunked in the tiger exhibit moat for a swimming test at the National Zoo in Washington, Wednesday, Nov. 6, 2013. All cubs born at the zoo must take a swim test before being allowed to roam in the exhibit. Bandar passed his test. (AP Photo/Manuel Balce Ceneta, File) less

AP10ThingsToSee - A three-month-old Sumatran tiger cub named "Bandar" reacts after being dunked in the tiger exhibit moat for a swimming test at the National Zoo in Washington, Wednesday, Nov. 6, 2013. All cubs ... more

Karis, a one month old lion cub being weighed at Blair Drummond Safari Park near Stirling, Scotland, Thursday Oct. 10, 2013. Weighing in at 5kg, the cub will stay with her mother, Teekay until she is 12 weeks old before they are returned to the pride. (AP Photo/Andrew Milligan/PA) UNITED KINGDOM OUT - NO SALES - NO ARCHIVES less

Karis, a one month old lion cub being weighed at Blair Drummond Safari Park near Stirling, Scotland, Thursday Oct. 10, 2013. Weighing in at 5kg, the cub will stay with her mother, Teekay until she is 12 weeks ... more

Photo: Andrew Milligan, Associated Press

Karis, a one month old lion cub being weighed at Blair Drummond... Photo-5954465.80970 - NewsTimes

A tiger cub rests at a nursery room at the Shanghai Zoo in... Photo-5954466.80970 - NewsTimes

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A 7-year-old white tiger sits with one of her cubs at Tobu Zoo in Miyashiro, near Tokyo, Thursday, May 2, 2013. Four newborn white tiger cubs made their first public appearance at the zoo on Thursday. The four cubs - one female and three males - were born 46 days ago. (AP Photo/Koji Sasahara) less

A 7-year-old white tiger sits with one of her cubs at Tobu Zoo in Miyashiro, near Tokyo, Thursday, May 2, 2013. Four newborn white tiger cubs made their first public appearance at the zoo on Thursday. The four ... more

Photo: Koji Sasahara, Associated Press

A 7-year-old white tiger sits with one of her cubs at Tobu Zoo in... Photo-5954467.80970 - NewsTimes

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White tiger cubs play in their enclosure at the Buenos Aires Zoo in Argentina, Thursday, March 21, 2013. The Argentine zoo is showing off four new white tiger cubs that Cleo, a Bengal white tiger, gave birth to on Jan. 14. Zoo officials say the blue-eyed cubs with coats of black stripes on white bring the number of White Bengal tigers at the zoo to nine. (AP Photo/Natacha Pisarenko) less

White tiger cubs play in their enclosure at the Buenos Aires Zoo in Argentina, Thursday, March 21, 2013. The Argentine zoo is showing off four new white tiger cubs that Cleo, a Bengal white tiger, gave birth ... more

Photo: Natacha Pisarenko, Associated Press

White tiger cubs play in their enclosure at the Buenos Aires Zoo in... Photo-5954468.80970 - NewsTimes

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Female tiger cub Sahaja (L) enjoys the cuddling of her mother Cindy in their enclosure at the zoo in Halle/Saale in eastern Germany on October 1, 2013. The tiger cub was born June 21, 2013 and named Sahaja , "The only one" since her two siblings died after birth.
AFP PHOTO / DPA/ JAN WOITAS GERMANY OUTJAN WOITAS/AFP/Getty Images less

Female tiger cub Sahaja (L) enjoys the cuddling of her mother Cindy in their enclosure at the zoo in Halle/Saale in eastern Germany on October 1, 2013. The tiger cub was born June 21, 2013 and named Sahaja , ... more

One of three endangered Malayan tiger cubs, born at Busch Gardens(R) Tampa on Sunday, March 31 is weighed at the park. The births are critical to help preserve the species as scientists estimate that only 500 remain in the wild. In approximately one month, the Busch Gardens animal care team will start introducing the cubs, two males and one female, to the Jungala habitat (www.jungala.com). The births are part of the park's partnership in the Association of Zoos and Aquariums (AZA) Species Survival Plan(R) (SSP). (PRNewsFoto/Busch Gardens Tampa) less

One of three endangered Malayan tiger cubs, born at Busch Gardens(R) Tampa on Sunday, March 31 is weighed at the park. The births are critical to help preserve the species as scientists estimate that only 500 ... more

Photo: Associated Press

One of three endangered Malayan tiger cubs, born at Busch... Photo-5954470.80970 - NewsTimes

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Three nine-month old tiger cubs are pictured in their enclosure at the Nehru Zoological Park in Hyderabad on February 15, 2014. The cubs, which have yet to be named, were presented for their first public viewing at the zoo. AFP PHOTO / Noah SEELAMNOAH SEELAM/AFP/Getty Images less

Three nine-month old tiger cubs are pictured in their enclosure at the Nehru Zoological Park in Hyderabad on February 15, 2014. The cubs, which have yet to be named, were presented for their first public ... more

Photo: NOAH SEELAM, AFP/Getty Images

Three nine-month old tiger cubs are pictured in their enclosure at... Photo-5954471.80970 - NewsTimes

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Three nine-month old tiger cubs are pictured in their enclosure at the Nehru Zoological Park in Hyderabad on February 15, 2014. The cubs, which have yet to be named, were presented for their first public viewing at the zoo. AFP PHOTO / Noah SEELAMNOAH SEELAM/AFP/Getty Images less

Three nine-month old tiger cubs are pictured in their enclosure at the Nehru Zoological Park in Hyderabad on February 15, 2014. The cubs, which have yet to be named, were presented for their first public ... more

Photo: NOAH SEELAM, AFP/Getty Images

Three nine-month old tiger cubs are pictured in their enclosure at... Photo-5954472.80970 - NewsTimes

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Three nine-month old tiger cubs are pictured in their enclosure with their monther Aparna (R) at the Nehru Zoological Park in Hyderabad on February 15, 2014. The cubs, which have yet to be named, were presented for their first public viewing at the zoo. AFP PHOTO / Noah SEELAMNOAH SEELAM/AFP/Getty Images less

Three nine-month old tiger cubs are pictured in their enclosure with their monther Aparna (R) at the Nehru Zoological Park in Hyderabad on February 15, 2014. The cubs, which have yet to be named, were presented ... more

Photo: NOAH SEELAM, AFP/Getty Images

Three nine-month old tiger cubs are pictured in their enclosure... Photo-5954473.80970 - NewsTimes

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A nine-month old tiger cub is pictured with its mother Aparna (R) in their enclosure at the Nehru Zoological Park in Hyderabad on February 15, 2014. The cubs, which have yet to be named, were presented for their first public viewing at the zoo. AFP PHOTO / Noah SEELAMNOAH SEELAM/AFP/Getty Images less

A nine-month old tiger cub is pictured with its mother Aparna (R) in their enclosure at the Nehru Zoological Park in Hyderabad on February 15, 2014. The cubs, which have yet to be named, were presented for ... more

Photo: NOAH SEELAM, AFP/Getty Images

A nine-month old tiger cub is pictured with its mother Aparna (R)... Photo-5954474.80970 - NewsTimes

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A nine-month old tiger cub (C) play fights with its mother Aparna (R) in their enclosure at the Nehru Zoological Park in Hyderabad on February 15, 2014. The cubs, which have yet to be named, were presented for their first public viewing at the zoo. AFP PHOTO / Noah SEELAMNOAH SEELAM/AFP/Getty Images less

A nine-month old tiger cub (C) play fights with its mother Aparna (R) in their enclosure at the Nehru Zoological Park in Hyderabad on February 15, 2014. The cubs, which have yet to be named, were presented for ... more

Photo: NOAH SEELAM, AFP/Getty Images

A nine-month old tiger cub (C) play fights with its mother Aparna... Photo-5954475.80970 - NewsTimes

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Six Amur Tiger cubs born in Copenhagen Zoo in Denmark late April 2013, came out into the open and could be seen by the public for the first time Thursday, May 30, 2013. The six cubs are from two litters born in late April by two tiger mothers.(AP Photo/Polfoto, Simon Fals) DENMARK OUT less

Six Amur Tiger cubs born in Copenhagen Zoo in Denmark late April 2013, came out into the open and could be seen by the public for the first time Thursday, May 30, 2013. The six cubs are from two litters born in ... more

Photo: FALS SIMON, Associated Press

Six Amur Tiger cubs born in Copenhagen Zoo in Denmark late April... Photo-5954476.80970 - NewsTimes

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Tbilisi Zoo director, Zurab Gurielidze, holds a ten-week-old white tiger cub while its mother, Cameron, looks from a cage in the zoo in Georgia's capital Tbilisi, on May 29, 2013. The white tigress gave birth to the three cubs in March. AFP PHOTO /VANO SHLAMOVVANO SHLAMOV/AFP/Getty Images less

Tbilisi Zoo director, Zurab Gurielidze, holds a ten-week-old white tiger cub while its mother, Cameron, looks from a cage in the zoo in Georgia's capital Tbilisi, on May 29, 2013. The white tigress gave birth ... more

Two white bengal tiger cubs play inside their cage at the Pringen Safari park in Pasuruan on August 29, 2013. A white bengal tiger Kartika (unseen) gave birth to three cubs named Badriah, d'Raisa and Salsabila on July 5 at the Pringen Safari park in Pasuruan. AFP PHOTO / JUNI KRISWANTOJUNI KRISWANTO/AFP/Getty Images less

Two white bengal tiger cubs play inside their cage at the Pringen Safari park in Pasuruan on August 29, 2013. A white bengal tiger Kartika (unseen) gave birth to three cubs named Badriah, d'Raisa and Salsabila ... more

Photo: JUNI KRISWANTO, AFP/Getty Images

Two white bengal tiger cubs play inside their cage at the Pringen... Photo-5954478.80970 - NewsTimes

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A keeper holds a one-month-old Sumatran tiger cub, one of three that were born last month, as he carries it from a cage to be shown to the public for the first time at Medan Zoo in Medan, North Sumatra, Indonesia, Wednesday, Nov. 14, 2012. Conservationists fear that the critically endangered species, now only around 250 left in the wild, may become extinct in the next decade due to poaching and habitat loss. (AP Photo/Binsar Bakkara) less

A keeper holds a one-month-old Sumatran tiger cub, one of three that were born last month, as he carries it from a cage to be shown to the public for the first time at Medan Zoo in Medan, North Sumatra, ... more

A tiger cub is held by a zookeeper at a Bali zoo in Gianyar, Bali, Indonesia, Wednesday, Sept. 4, 2013. The tiger was born on Aug. 22. (AP Photo/Firdia Lisnawati)

A tiger cub is held by a zookeeper at a Bali zoo in Gianyar, Bali, Indonesia, Wednesday, Sept. 4, 2013. The tiger was born on Aug. 22. (AP Photo/Firdia Lisnawati)

Photo: Firdia Lisnawati, Associated Press

A tiger cub is held by a zookeeper at a Bali zoo in Gianyar, Bali,... Photo-5954480.80970 - NewsTimes

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A 7-year-old white tiger sits with one of her cubs at Tobu Zoo in Miyashiro, near Tokyo, Thursday, May 2, 2013. Four newborn white tiger cubs made their first public appearance at the zoo on Thursday. The four cubs - one female and three males - were born 46 days ago. (AP Photo/Koji Sasahara) less

A 7-year-old white tiger sits with one of her cubs at Tobu Zoo in Miyashiro, near Tokyo, Thursday, May 2, 2013. Four newborn white tiger cubs made their first public appearance at the zoo on Thursday. The four ... more

Photo: Koji Sasahara, Associated Press

A 7-year-old white tiger sits with one of her cubs at Tobu Zoo in... Photo-5954481.80970 - NewsTimes

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One of white tiger cubs sits at Tobu Zoo in Miyashiro, near Tokyo, Thursday, May 2, 2013. Four newborn white tiger cubs made their first public appearance at the zoo on Thursday. The four cubs - one female and three males - were born 46 days ago. (AP Photo/Koji Sasahara) less

One of white tiger cubs sits at Tobu Zoo in Miyashiro, near Tokyo, Thursday, May 2, 2013. Four newborn white tiger cubs made their first public appearance at the zoo on Thursday. The four cubs - one female and ... more

Photo: Koji Sasahara, Associated Press

One of white tiger cubs sits at Tobu Zoo in Miyashiro, near Tokyo,... Photo-5954482.80970 - NewsTimes

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White tiger cubs crawl as four newborn cubs made their first public appearance at Tobu Zoo in Miyashoro, near Tokyo, Thursday, May 2, 2013. The four cubs - one female and three males - were born on March 16. (AP Photo/Koji Sasahara) less

White tiger cubs crawl as four newborn cubs made their first public appearance at Tobu Zoo in Miyashoro, near Tokyo, Thursday, May 2, 2013. The four cubs - one female and three males - were born on March 16. ... more

Photo: Koji Sasahara, Associated Press

White tiger cubs crawl as four newborn cubs made their first public... Photo-5954484.80970 - NewsTimes

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Three Bengala tiger cubs struggle to suckle, at the zoo in Asuncion, on November 12, 2013. The cubs were born in captivity --on November 9-- from tigers seized last year from a circus attempting to travel to Argentina without sanitary permits. AFP PHOTO / Norberto DUARTENORBERTO DUARTE/AFP/Getty Images less

Three Bengala tiger cubs struggle to suckle, at the zoo in Asuncion, on November 12, 2013. The cubs were born in captivity --on November 9-- from tigers seized last year from a circus attempting to travel to ... more

Indira, a bengal white tigress, sits with her ??cubs at the zoo of Cali, Colombia, on February 6, 2014. The three cubs were born on November 30, 2013. AFP PHOTO / LUIS ROBAYOLUIS ROBAYO/AFP/Getty Images

Indira, a bengal white tigress, sits with her ??cubs at the zoo of Cali, Colombia, on February 6, 2014. The three cubs were born on November 30, 2013. AFP PHOTO / LUIS ROBAYOLUIS ROBAYO/AFP/Getty Images

Photo: LUIS ROBAYO, AFP/Getty Images

Indira, a bengal white tigress, sits with her ??cubs at the zoo of... Photo-5954486.80970 - NewsTimes

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Indira, a bengal white tigress, lies down with one of her ??cubs at the zoo of Cali, Colombia, on February 6, 2014. The three cubs were born on November 30, 2013. AFP PHOTO / LUIS ROBAYOLUIS ROBAYO/AFP/Getty Images less

Indira, a bengal white tigress, lies down with one of her ??cubs at the zoo of Cali, Colombia, on February 6, 2014. The three cubs were born on November 30, 2013. AFP PHOTO / LUIS ROBAYOLUIS ROBAYO/AFP/Getty ... more

Photo: LUIS ROBAYO, AFP/Getty Images

Indira, a bengal white tigress, lies down with one of her ??cubs at... Photo-5954487.80970 - NewsTimes

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Indira, a bengal white tigress, lies down with one of her ??cubs at the zoo of Cali, Colombia, on February 6, 2014. The three cubs were born on November 30, 2013. AFP PHOTO / LUIS ROBAYOLUIS ROBAYO/AFP/Getty Images less

Indira, a bengal white tigress, lies down with one of her ??cubs at the zoo of Cali, Colombia, on February 6, 2014. The three cubs were born on November 30, 2013. AFP PHOTO / LUIS ROBAYOLUIS ROBAYO/AFP/Getty ... more

Photo: LUIS ROBAYO, AFP/Getty Images

Indira, a bengal white tigress, lies down with one of her ??cubs at... Photo-5954488.80970 - NewsTimes

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Indira, a bengal white tigress, lies down with one of her ??cubs at the zoo of Cali, Colombia, on February 6, 2014. The three cubs were born on November 30, 2013. AFP PHOTO / LUIS ROBAYOLUIS ROBAYO/AFP/Getty Images less

Indira, a bengal white tigress, lies down with one of her ??cubs at the zoo of Cali, Colombia, on February 6, 2014. The three cubs were born on November 30, 2013. AFP PHOTO / LUIS ROBAYOLUIS ROBAYO/AFP/Getty ... more

Photo: LUIS ROBAYO, AFP/Getty Images

Indira, a bengal white tigress, lies down with one of her ??cubs at... Photo-5954489.80970 - NewsTimes

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Indira a bengal white tigress, lies down with her ??cubs at the zoo of Cali, Colombia, on February 6, 2014. The cubs were born on November 30, 2013. AFP PHOTO / LUIS ROBAYOLUIS ROBAYO/AFP/Getty Images

Indira a bengal white tigress, lies down with her ??cubs at the zoo of Cali, Colombia, on February 6, 2014. The cubs were born on November 30, 2013. AFP PHOTO / LUIS ROBAYOLUIS ROBAYO/AFP/Getty Images

Photo: LUIS ROBAYO, AFP/Getty Images

Indira a bengal white tigress, lies down with her ??cubs at the zoo... Photo-5954490.80970 - NewsTimes

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Sumatran tiger cub "C.J." makes his first public appearance at the Sacramento Zoo in front of visiting children Kristina Polyashenko 6, left, and her brother Max Polyashenko, 4, from Roseville, Calif., in Sacramento on Tuesday, June 11, 2013. The cub was born to male tiger "Castro," and female tiger "Bahagia" at the Sacramento Zoo on March 3. (AP Photo/The Sacramento Bee, Randall Benton) MAGS OUT; LOCAL TV OUT (KCRA3, KXTV10, KOVR13, KUVS19, KMAZ31, KTXL40); MANDATORY CREDIT less

Sumatran tiger cub "C.J." makes his first public appearance at the Sacramento Zoo in front of visiting children Kristina Polyashenko 6, left, and her brother Max Polyashenko, 4, from Roseville, Calif., in ... more

This undated photo provided by the Pittsburgh Zoo and PPG Aquarium shows the new Amur tiger cub in a restricted area at the zoo. The cub is still too small to display in the zoo's outside yard, so visitors will hve to settle for viewing him on a video monitor at a window into the outdoor display. (AP Photo/Pittsburgh Zoo and PPG Aquarium, Paul A. Selvaggio) less

This undated photo provided by the Pittsburgh Zoo and PPG Aquarium shows the new Amur tiger cub in a restricted area at the zoo. The cub is still too small to display in the zoo's outside yard, so visitors will ... more

One of two Sumatran tiger cubs peeks out from a set of stairs during the cubs' public debut at the National Zoo in Washington, Monday Nov. 18, 2013. The cubs, who were born in August, are now on public view. (AP Photo/Jacquelyn Martin) less

One of two Sumatran tiger cubs peeks out from a set of stairs during the cubs' public debut at the National Zoo in Washington, Monday Nov. 18, 2013. The cubs, who were born in August, are now on public view. ... more

Photo: Jacquelyn Martin, Associated Press

One of two Sumatran tiger cubs peeks out from a set of stairs... Photo-5954493.80970 - NewsTimes

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Damai, a Sumatran tiger, plays with one of her two cubs as the cubs make their public debut at the National Zoo in Washington, Monday Nov. 18, 2013. The cubs, who were born in August, are now on public view. (AP Photo/Jacquelyn Martin) less

Damai, a Sumatran tiger, plays with one of her two cubs as the cubs make their public debut at the National Zoo in Washington, Monday Nov. 18, 2013. The cubs, who were born in August, are now on public view. ... more

Photo: Jacquelyn Martin, Associated Press

Damai, a Sumatran tiger, plays with one of her two cubs as the cubs... Photo-5954494.80970 - NewsTimes

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Two Sumatran tiger cubs, Bandar and Sukacita, play as they make their public debut at the National Zoo in Washington, Monday Nov. 18, 2013. The two cubs were born in August and are now on public view. (AP Photo/Jacquelyn Martin) less

Two Sumatran tiger cubs, Bandar and Sukacita, play as they make their public debut at the National Zoo in Washington, Monday Nov. 18, 2013. The two cubs were born in August and are now on public view. (AP ... more

Photo: Jacquelyn Martin, Associated Press

Two Sumatran tiger cubs, Bandar and Sukacita, play as they make... Photo-5954495.80970 - NewsTimes